#include<stdio.h>

int main(){
    const int x=3;
    int y=5;
    printf("&x=%d &y=%d\n",&x,&y);
    int *p=&y;
    p[-1]++;
    printf("x=%d y=%d\n",x,y);
    p[1]++;
    printf("x=%d y=%d\n",x,y);
    return 0;
}
